Grinding apparatus



July 15, 1947. A. B. CARBONE Er Al. A 2,423,826

GRINDING `APPARATUS Filed nec. 14, 1,945

2 IIWENTOYRS1 Ange/0 5. Caro/one /4//7//5/77 Gorman 'BY Franc/'s A. Rar/ck Patented July 15, 1947 GRINDING APPARATUS Angelo B. Cardone, Camden, N. J., and William J. Gorman, Darby, and Francis A. Rarick,

Philadelphia, Pa.

Application December 14, 1945, Serial No. 635,138

(Granted under the act of March 3, 1883, as

3 Claims.

amended April 30, 1928; 370 0. G. 757) This invention relates in general to a grinding fixture and in particular an apparatus for grinding level surfaces.

It has previously required rather expensive and bulky equipment for grinding level surfaces and edges to a relatively fine degree of accuracy and regularity, and accordingly it is an object of this invention to provide a simple and convenient apparatus for grinding surfaces and the like to a substantially even, level surface.

It is a further object of this invention to provide a portable grinding tool smoothly and slidably mounted on a plane surface.

Further objects and advantages of this invention as well as its construction, arrangement and operation will be apparent from the following description and claims in connection with the aocompanying drawings, in which:

Fig, l is an isometric view of a grinding apparatus according to this invention showing a cross-piece in position to be ground, and

Fig. 2 is an exploded fragmentary cross section of the sliding surfaces of the device shown in Fig. 1, taken along line 2-2.

Referring to the figures in detail the apparatus comprises in general a grinding tool generally designated IIJ, slidably positioned on a flat table II, and a supporting table I2 positioned parallel with said fiat table II. The grinding tool comprises a conventional grinder such as, for example, an air or electric grinder I3 having a motor I4 and a grinding wheel I5. The grinder I3 is adjustably mounted on a stand I6 which optionally has height; control by conventional means such as thumb screw I'I. The base of this stand I6 comprises a flat plate I8 having a smoothly machined lower surface I9, and is positioned on the surface of table Il which is likewise smoothly machined and is preferably lightly oiled.

The sliding interfaces between base I8 and table I I are characterized by being smoothly and easily moved from one position to another relative to each other and yet by being separated only with difficulty. The smooth machining of these two surfaces optionally coupled with light oiling of the surfaces results in a strong attraction but smoothly slidable relation between the two surfaces. This permits an operator to move the grinding tool I along the surface with maximum ease and accuracy and yet avoid danger of a separation between the surfaces.

The upper table I2 is positioned parallel to the lower table I I by means of a plurality of supports 2l).l There may optionally be provided minor adjustment of the height and slope of this table,

for example by means of lock nuts 2| positioned at the base of these supports. Bolts (not shown) below the table II secure these supports in position.

In use and operation of the apparatus the workpiece 22 is placed on this upper table I2 with the surface to be ground facing upwardly and the height and slope of the upper table is adjusted if necessary to bring this working surface parallel with lower table II. The grinding tool I0 is then placed on table II and is moved around somewhat in a sliding motion to assure firm contact between the sliding surfaces. The height of the grinding wheel I5 is then adjusted by means of thumb screw I1 and power turned on to operate the wheel and the tool is then slidably moved on table II to bring the grinding wheel to bear on all positions of the surface to be ground. A smooth, evenly ground surface thereby results.

It will be understood that there may be numerous modifications and changes in the design and construction of this apparatus and that the description in connection with Figs. l and 2 is merely given as illustration and not in limitation of the scope of the invention. Accordingly numerous types of grinding wheels may be used as also may various types of supporting members. These variations will be within the ability of those skilled in the art and it is understood that the scope of the invention is only to be limited to the appended claims.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

What is claimed is:

1. Grinding apparatus comprising a grinding tool mounted on a stand having a flat base, an element having a smooth" surface, said base being slidably positioned on said smooth surface, a supporting table positioned above said smooth surface and parallel thereto, said supporting table being adapted to receive a workpiece and to support said workpiece with :a work surface positioned to be contacted by the grinding means of said stand is adapted to slide readily alongsaid y surface and is separated therefrom only with diiiiculty, a supporting surface adapted to receive a workpiece and support said workpiece with a work surface positioned to be contacted by the grinding means of said grinding tool as said tool is caused to slide on said smooth surface.

3. Apparatus for` performing work upon a workpiece comprising a toolholder mounted on a stand having a base, an element having a surface, said base being slidably positioned on said surface, a supporting table positioned in spaced relation and substantially parallel to said .surface, said supporting table being adapted to receive a workpiece and to support said workpiece with a Work surface positioned to be contacted by a tool held by said toolholder as said toolholder is caused to slide on said surface.

ANGELO B. CARDONE. WILLIAM J. GORMAN. FRANCIS A. RARICK.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Y Date 2,367,839 Grover Jan. 23, 1945 2,230,292 Faso Feb. 4, 1941 2,365,302 Shutt et al Dec. 19, 1944 2,128,023 Specht et al. Aug. 23, 1938 FOREIGN PATENTS Number Country Dater 465,620 Germany Sept. 24, 1928 

